topic Re: Data Reading from the SD CARD in i.MX Processors

Data Reading from the SD CARD

Shashi_ranjan_14 — Mon, 16 Jan 2023 06:17:13 GMT

Hello all,

I want to read data from an SD card. I can read the display, but they only print the "char" value. Can anyone teach me how to read a float or decimal value and print it? now i am using imxrt1050 board using mcuXpresso.

Thanks

@nxp @IMXRT1050

Re: Data Reading from the SD CARD

jingpan — Wed, 18 Jan 2023 07:37:41 GMT

Hi @Shashi_ranjan_14 ,

You can use a float pointer to do this.

Regards,

Jing

Re: Data Reading from the SD CARD

Shashi_ranjan_14 — Wed, 01 Feb 2023 06:45:16 GMT

We successfully write on the SD card and read from the SD card, while reading from SD card we were able get data via "char" only. To get the data we are receiving by using sprintf and fscanf function.

In SD card file we have provided integer data and we want to read data such as double and float.

For above technical support u provide solution as use float pointer for that can provide a example to execute?

Re: Data Reading from the SD CARD

jingpan — Thu, 02 Feb 2023 07:36:53 GMT

Hi @Shashi_ranjan_14 ,

Like these code

char ch; float *p; char data[4]; float i=3.14159; char *pd; PRINTF("%f\r\n",i); pd = (char*)&i; for(ch=0;ch<4;ch++) data[ch]=*pd++; p=(float*)&data[0]; PRINTF("%f\r\n",*p);

https://community.nxp.com/t5/i-MX-RT/How-to-print-the-quot-negative-float-point-number-quot-to-show/m-p/1056720

Regards,

Jing